[readme] Fix fish load_nvm function
diff --git a/README.md b/README.md
index cc49c97..387640d 100644
--- a/README.md
+++ b/README.md
@@ -564,7 +564,7 @@
   if test -n "$nvmrc_path"
     set -l nvmrc_node_version (nvm version (cat $nvmrc_path))
     if test "$nvmrc_node_version" = "N/A"
-      nvm install $nvmrc_node_version
+      nvm install (cat $nvmrc_path)
     else if test nvmrc_node_version != node_version
       nvm use $nvmrc_node_version
     end